Pipe-wrench



A. E. UPTON. PIPE WRENCH.

(No Model.)

Patented June 20, 1893. I

MALI/7705565.

UNITED STATES PATENT OFFICE.

ARTHUR E. UPTON, OF GOEHNER, NEBRASKA.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 499,765, dated June 20,1893. Application filed November 12, 1892. Serial No. 451,825. (Nomodel.)

To all whom it may concern.-

Be it known that I, ARTHUR E. UPTON, a citizen of the United States,residing at Goehnor, in the county of Seward and State of Nebraska,haveinvented certain new and useful Improvement in Pipe-Wrenches, ofwhich the following is a specification.

In the accompanying drawings, which are made a part hereof,Figure 1, isa side elevation of a wrench embodying the invention, and Fig. 2, is asection thereof. a

A represents a lever handle carrying at one end the fixed jaw B of thewrench. To one end of this fixed jaw is connected, by a pivot pin 0, themovable jaw D. Patent No. 470,042, issued March 1, 1892, to F. L.George, shows a Wrench having jaws similar to the jaws of my improvedwrench, and said patent shows also a spring bearing against thecam-shaped hub of the movable jaw and adapted to engage a stop wall onsaid jaw, the object of said spring, as stated in the patent, being toprevent the loose swinging movements of the jaw and also to limit theopening movement thereof.

My improved wrench is provided with a spring (shown at E) but it is foran entirely different purpose. The object of the spring, in my wrench,is togive the movable jaw a constant tendency to close, or approach thefixed jaw, and to this end, I cause the spring to exert its forceagainst the movable jaw in a line that is forward of the pivot. In orderto reduce the friction, I cause the spring to exert its force throughthe medium of an anti-friction roller F, mounted upon a pin f, which hasits bearings in the movable jaw, the jaw being recessed at d to receivethe roller and also the end of the spring.

It has heretofore been proposed to cause a spring to bear directlyagainst the back of the jaw for closing it, but in practice it is foundthat with such an arrangement the spring is deflected beyond its limitof elasticity, and thereby its efficiency is destroyed. In order toobviate this, I curve the spring 6 (where it bears against the jaw) andI so 10- cate this curved part that it is only slightly.

eccentric with relation to the center of motion of the jaw, and Iprovide the jaw with the recess into which the end of the spring enters.With this arrangement, the amount of deflection may be reduced to aminimum.

Another object of the present invention, is to provide wrenches havingthe general characteristics of the one above described, with means forpreventing small pipes, rods, or

other objects from entering between the jaws too far. To this end, Isecure to one of the jaws a stop that crosses the'space between thejaws. This stop may consist of a spring bar or plate G, pivoted at g,and any desired number of studs or small protube-rances H forrestraining its movement and holding it either in operative position, asshown by full lines, or out of operative position, as indicated bydotted lines. In order to move the stop past either of the studs,it islifted from contact with the jaw.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent, is I 1. The combination with a fixedand a movable jaw, of a spring having a portion that is eccentric withrelation to the pivot of the movable jaw, and an anti-friction rollercarried by the movable jaw and having contact with the eccentric portionof the spring, so that as the jaw movesthe point of contact with thespring shifts, making the angular movement of the spring less than theangular movement of the anti-friction roller, substantially as setforth.

2. The combination with a fixed jaw and a movable jaw, of ananti-friction roller journaled to said movable jaw at a point forward ofits pivot, and a spring engaging said roller, the portion of the springthat engages said roller being curved and. eccentric with relation tothe pivot of the jaw, said jaw being recessed to receive said rollerand. the end of the spring, substantially as set forth.

3. In a wrench, the combination with a pair of jaws, of a stopconsisting of plate pivoted to one of said jaws and movableindependently of the other, so as not to restrain the movement of thepivoted jaw, said plate being adapted to project across the openingbetween them, and a stud projecting from one of said jaws and engagingsaid plate for preventing its inward movement, substantially as setforth.

ARTHUR E. UPTON. Witnesses:

L. OHADWIOK, B. OVERHOLTS.

IOO

